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The SFR licence activates the single-frequency repeater function.
A single-frequency repeater uses two time slots on a single frequency for simultaneous reception and transmission in DMR mode. It receives voice or data on one slot and transmits it on the other slot. It can implement the single-frequency repeater function by using the same frequency for both RX and TX. This function is supported only on specific firmware versions of the TM840, DP9XX and DR700 radios.